interface Radio {
    switchRadio(trigger: boolean): void;
}

interface Battery {
    checkBattertStatus(): void;
}

interface RadioWithBattery extends Radio {
    checkBatteryStatus(): void;
}

class Car implements Radio {
    switchRadio(trigger: boolean) {

    }
}

class Cellphone implements Radio {
  switchRadio(trigger: boolean) {

  }
  checkBatteryStatus() {

  }
}